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Introduce t_isalnum() to replace t_isalpha() || t_isdigit() tests.

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ts_locale.c omitted support for "isalnum" tests, perhaps on the
grounds that there were initially no use-cases for that.  However,
both ltree and pg_trgm need such tests, and we do also have one
use-case now in the core backend.  The workaround of testing
isalpha and isdigit separately seems quite inefficient, especially
when dealing with multibyte characters; so let's fill in the
missing support.

Discussion: https://postgr.es/m/2548310.1664999615@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2022-10-06 11:08:56 -04:00
parent 5757141cae
commit ca71131eeb
5 changed files with 20 additions and 3 deletions
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src/include/tsearch/ts_locale.h
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@ -42,6 +42,7 @@ typedef struct
extern int t_isdigit(const char *ptr);
extern int t_isspace(const char *ptr);
extern int t_isalpha(const char *ptr);
extern int t_isalnum(const char *ptr);
extern int t_isprint(const char *ptr);
extern char *lowerstr(const char *str);